The whole setup does require a substantial additional investment (1 mil+ depending on how many pallet storage sheds you use), and if pulling in lots of straw around the clock you have to be diligent in moving the pallets to storage every quarter hour or so (thereby managing 16-20 pallets / hour, worth 30-40k+ when finally sold at a good price) but you can also develop ways and means of streamlining the operation to maximize the profit for the time invested, especially on a multiplayer map with more hands to share the workload. In terms of maximum profit per square acre / hectare of cultivated land, it's hard to beat oat with Addon Straw Harvest mod so you can turn the straw swath into pallets of straw pellets, thereby easily more than doubling the amount of cash generated from a single field of wheat / barley / oat.
